Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6d446cc64afb8d0…

MALICIOUS

PDF

90.1 KB Created: 2021-09-18 16:05:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 5fc51b959975030716db6d6eb38827eb SHA-1: 5b8ed24dac19b949cc24f48d7f0d7032e5e9fe6a SHA-256: a6d446cc64afb8d0b72def255727fa55f596bade97282ccb08730f744a738163
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories and disposable hosting. Heuristics indicate this is a link farm designed to lure users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/m6okf488vaqja9l37iardgnp96/titegipugikupofaniviti.pdf In PDF document text
    • http://grandfiltr.com/files/file/24024874116.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/4405735068.pdfIn PDF document text
    • https://roarmysecurity.ro/mm/file/galutizopufidegefumuluku.pdfIn PDF document text
    • https://khoahoc.timviec365.com/picturesfiles/xeketuketisanunoxilikanov.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/wulebepadotebakiwalenedi.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/gujafekitalikip.pdfIn PDF document text
    • http://qianxi.cn/filespath/files/20210912075651.pdfIn PDF document text
    • https://ipkameros.lt/userfiles/file/femulafod.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/12315652302.pdfIn PDF document text
    • http://atek-ent.com/upload/file/tefenobuma.pdfIn PDF document text
    • https://brakos.it/file/bomubosa.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/g41o86e2lmivs9vidrvq2f7rfd/kafajesazedubosuzatisofo.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/nogiv.pdfIn PDF document text
    • https://dalba.net/other_files/File/bufurepikowaluji.pdfIn PDF document text
    • http://hillcrestneighborhoods.com/userimages/gupigu.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/97501489449.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/82u8uea6u2e0rrpbpkbtdl28n5/kokatuxigarivuzaxuxasari.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/6962716099.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/nudumer.pdfIn PDF document text
    • https://foursservices.com/nbloom/fckuploads/file/powufarod.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/dawaxagege.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/fazigalakimewuwogezokakuv.pdfIn PDF document text
    • http://ecole-belair.com/ecole/file/7925612203.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/nodimapilulubulabebuwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=motorola+droid+razr+dockPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D1 19088 bytes
SHA-256: 54de8e15d983581b7ff763e904d865f6e71f9fa1753a53aed99dcb3cd70ed92c
font_01_sfnt_off00012bef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14406 10104 bytes
SHA-256: cff33b63ef93ccaedf3d384e4eebdf6ce538fe6022b318eacb7f6377c01b5b16

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